<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>登录页面</title>
    <link rel="stylesheet" href="css/common.css">
    <link rel="stylesheet" href="css/login.css">
</head>
<body>
    <!-- 导航栏 -->
     <div class="nav">
        网页聊天
     </div>
     <!-- 主窗口区 -->
      <div class="login-container">
        <div class="login-dialog">
            <h3>登录</h3>
            <div class="row">
                <span>用户名</span>
                <input type="text" id="username">
            </div>
            <div class="row">
                <span>密码</span>
                <input type="password" id="password">
            </div>
            <div class="row">
                <button id="submit">登录</button>
            </div>
        </div>
      </div>

      <!-- 引入jquery -->
       <script src="https://cdn.bootcdn.net/ajax/libs/jquery/3.7.1/jquery.min.js"></script>
       <!-- 实现前后端交互逻辑 -->
        <script>
            let submitButton = document.querySelector('#submit');
            submitButton.onclick = function() {
                // 1.先获取到输入框中的内容, 
                let username = document.querySelector('#username').value;
                let password = document.querySelector('#password').value;
                if (username == '' || password == '') {
                    alert("当前输入的用户名或者密码为空!");
                    return;
                }
                // 2.再发送ajax请求
                $.ajax({
                    url: '/login',
                    type: 'post',
                    data: {
                        'username': username,
                        'password': password
                    },
                    success: function(body) {
                        // 3.处理响应
                        if (body && body.userId > 0) {
                            alert("登陆成功!");
                            // 跳转到主页面
                            location.assign('/client.html');
                        } else {
                            alert("登陆失败!");
                        }
                    }
                });
            }
        </script>
</body>
</html>